Tool and method for friction stir processing using the friction stir processing tool
a technology of friction stir and tool, which is applied in the direction of manufacturing tools, soldering devices,auxillary welding devices, etc., can solve the problems of high cost, easy to break, and inability to join, so as to improve abrasion resistance, high hardness, and high hardness
Inactive Publication Date: 2014-10-14
PUBLIC UNIVERSITY CORPORATION OSAKA CITY UNIVERSITY +2
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AI Technical Summary
Benefits of technology
The present invention provides a friction stir processing tool made of a Ni-based dual multi-phase intermetallic compound alloy that has high hardness and improved abrasion resistance, allowing for long periods of friction stir processing without Wear-related issues can be endured by heat-treating the alloy material. This means that even high processing temperatures can be reached for proper friction stir processing of workpieces such as iron and iron alloys.
Problems solved by technology
However, the tool made of steel such as SKD steel has the problem that it is soon deformed due to attrition or the like, so that joining cannot be performed.
A tool made of ceramic has the problem that it is expensive and is easily broken, and it is easily worn away particularly when the work is stainless steel.
Method used
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Effect test
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[0079]Next, the following experiments were conducted for confirming the effect of a friction stir processing tool including a Ni-based dual multi-phase intermetallic compound alloy containing Re, with which the tool life is increased and proper friction stir welding can be performed over a long period of time.
(Preparation of Friction Stir Processing Tool)
[0080]Base metals of Ni, Al, V, Ta and Re (each having a purity of 99.9% by weight) and B were weighed so as to have a composition including 72 atom % of Ni, 7 atom % of Al, 13 atom % of V, 5 atom % of Ta, 3 atom % of Re and 50 ppm by weight of B, and treated by . a vacuum induction melting method to prepare 0.3 kg of an ingot (cast raw material). The cast raw material was cutting-processed into a tool shape shown below, and then subjected to a heat treatment at a temperature of 950° C. for 5 hours as an aging heat treatment (lower multi-phase heat treatment) to prepare the present friction stir welding tool 1 shown in FIG. 1.
(Shape...
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Abstract
A friction stir processing tool is formed from a Ni-based dual multi-phase intermetallic compound alloy containing rhenium(Re). The Ni-based dual multi-phase intermetallic compound alloy is preferably formed by casting, while gradually cooling, a melt containing all the components of the composition and is preferably heat treated after casting. Moreover, in a method for friction stir processing, a work is softened by friction heat generated when the friction stir processing tool, while rotating, is pressed against the work to be processed. The friction stir processing tool includes the Ni-based dual multi-phase intermetallic compound alloy, and therefore further high hardness is exhibited to improve abrasion resistance, so that even a long period of friction stir processing can be endured.
Description
TECHNICAL FIELD[0001]The present invention relates to a friction stir processing tool which is capable of subjecting a work of a metal material such as iron or an iron alloy to friction stir processing over a long period of time, and a method for friction stir processing using the friction stir processing tool.BACKGROUND ART[0002]There is a joining method in which when works such as aluminum alloy plates are joined, a rod-shaped tool (a tool having a shoulder portion having a large diameter and a probe projectingly provided at the tip thereof) rotating at a high speed is pressed against and inserted into one end of a butting portion formed by butting joint surfaces of the works, the tool, while rotating at a high speed, is moved to the other end along the butting portion, and the butting portion is softened by frictional heat generated at this time, thereby joining the works. This method is a technique called friction stir welding (FSW).[0003]According to the friction stir welding, ...
Claims
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IPC IPC(8): B23K20/12C22C19/00C22C19/03C22F1/10
CPCB23K20/125C22C19/03C22C19/007C22F1/10B23K20/1255B23K20/12
Inventor TAKASUGI, TAKAYUKIKANENO, YASUYUKIOKI, SACHIOHIRATA, TOMOTAKEMOCHIZUKI, NOBORU
Owner PUBLIC UNIVERSITY CORPORATION OSAKA CITY UNIVERSITY